const mongoose = require("mongoose");
mongoose.connect("mongodb://localhost:27017/blog",{
    useNewUrlParser: true,
    useUnifiedTopology: true,
    // useFindAndModify: false
})

.then(()=>{
    console.log('数据库连接成功')
})
.catch(e=>{
    console.log('数据库连接失败',e)
})